astrology aspects

[sillynut]

well basically i paid for a chart but there are some terms i don't really understand and can't find anywhere on the internet or on the jos azazel's astrology..I don't know any decent astrology books to use or articles to find out the astrology aspects i was having problems with..I know there are issues with infiltrators and worries about safety among brothers and sisters even on here but am going to give examples of some of the terms i find difficult. Most of them are minor aspects anyway but i still wanted an idea of what they meant, as i couldn't find the definitions anywhere:-
sun sesi-square midheaven
mercury sesi-square midheaven
moon sesi-square saturn
moon opposition descendant
moon square midheaven and IC
moon conjunct south node
mercury bi-quintile north node...........there's others but i just decided to put these on here so far

If anyone has any ideas please either let me know on here or in my yahoo email..thanks